Sewing-machine presser-foot.



I .A; H. DE v05 SEWING MACHINE PRESSER FOOT, v APPLICATIONJIILED JUNE20. I916.

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UNITED STATES PATENT oEEIcE.

ALBERT H. DE VOE, OF WESTFIELD, NEW JERSEY, ASSIGNOB TO THE SINGER MANU-FACTUBING COMPANY, A CORPORATION OF NEW JERSEY.

SEWmG-MACHINE PBESSEB-FOOT.

To all whom it may concem:

Be it known that I, ALBERT H. DE V01], a citizen of the United States,residing at l/Vestfield, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Sewing-MachinePresser-Feet, of which the following is a specification, reference beinghad therein to the acompanying drawings.

This invention has for its object to pro {vide a sewing-machinepresser-foot with means for cutting, with certainty and close to thework, the stitching-threads and any loose threads of the fabric atthecompletion of a seam.

According to the present invention the presser-foot is preferably formedwith a foot-plate havingin its rearward end a forwardly extending notchadjacent which its upper face affords a seat upon which is secured athread-cutting blade having a sharpened edge above one side of saidnotch and extending into a clearance notch or recess between saidfoot-plate and the presser-foot shank which partially overhangs suchcutting edge. With a resser-foot so constructed, at the completion of aseam the threads extending from the work may be drawn forwardly into thenotch and across the cutting edge of the knife-blade against which theyare pressed by the overhanging portion of the foot and thereby severedclose to the work.

The clearance recess is preferably deeper than the thickness of theknife-blade, so that when the threads are drawn against the blade theiradvance is not wholly obstructed at the crossing of the overhanging withthe cutting edge, but they become wedged within the space between thetwo and in their continued movement travel slightly along the cuttingedge so as to be severed by a draw-cut. Y

In the accompanying drawings, Figure 1 is a perspective view of aresser-foot constructed in accordance with the present im- .provement,and showing the manner in bottom view of the presser-foot. Fig. 6 is aperspective view, taken from the under side, of the thread-cuttingknife, detached. Figs. 7 8 and 9 are respectively a side ele-Specification of Letters Patent.

Patented Dec. 25, 191'?a Application filed June 20, 1916. Serial No.104,651.

vation, a plan, and a rear end view of another form of resser-footembodying the present invention.

As represented in Figs. 1 to 6 inclusive, the presser-foot isconstructed with the usual slotted shank 1 formed with the forwardlyofiset portion 2 connected with and sustaining the rearward portion ofthe foot-plate 3 which is provided with the usual needleaperture 4:. Thefoot-plate is shown rovided at its rearward end with the forwardlyextending l-shaped notch 5 at one side of which the shank is formed witha lateral clearance notch or recess 6 of which the bottom is flush withthe top of the foot-plate.

The upper face of the foot-plate affords a seat upon which is secured bymeans of the fastening screw 7 the angular knife-blade 8 having at itsupper face the sharpened knife edge 9 disposed at the outer side of thenotch 6 and extending substantially parallel therewith and into therecess 6 by the upper wall of which it is overhung.

The lateral notch or recess 6 is shown in Figs. 2 and 3 as deeper thanthe thickness of the blade 8 so as to leave a thin space between theiradjacent faces to receive the thread. The portion 2 of the resser-footshank is shown having one corner cut away or beveled at 2correspondingly with the adjacent side of the notch 6 to assist indirecting the thread to the sharpened edge of the cutting blade.

-'The blade 8 is formed with a lateral-extension 10 terminating in ashoulder to embrace the shank portion 2 for assisting the screw 7 inholding the blade securely in place.

In the use of this presser-foot, the seam s is formed in the usualmanner in the fabric m, and at its completion the operator draws thestitching-threads t upwardly and forwardly, as'represented in Fig. 1,the threads being deflected by the inclined face 2 of the shank portion2 toward the cutting edge 9 of the knife-blade by which it is initiallydeflected into the notch 6 and beneath the overhanging portion of theshank 2 between the wall of which and the knife-blade it becomes jammedso as to be pressed against the sharpened edge of the blade in itscontinued movement wherein it is severed with certainty by a draw-cutaction. While the overhang of the portion of the resser-foot immediatelyabove the knife-blade acts to force the thread against the cutting edgeof the latter, the slight spacing of such overhanging portion above theupper face of the knife-blade obviously contributes materially to thecertainty of action of the device in severing the thread by a draw-cutrather than by a tearing action.

In the form of the improvement repre sented in Figs. 7, 8 and 9, thepresser-foot shank 1 is shown formed with a forwardly projecting portion2 to the forward end of which is pivotally secured by means of the pin11, the spaced upwardly extending ears 12 of the separate foot-plate 3which is provided, as in the previously described form of theimprovement, with the needle-aperture 4 and the thread-notch 5 partiallyoverhung by the shank portion 2'. A clearance notch or recess 6 isformed in the footplate 3 beneath the presser-foot extension 2'affording a seat upon which is secured by means of the screw 7 theknife-blade 8' formed with the cutting edge 9 arranged similarly to thatof the corresponding element of the foot previously described.

In this form of the improvement the shank is shown formed with a bevel2* to assist in directing the thread, but the fiat side of the shankextension 2 is the part which directs the thread initially against theknife-edge; but otherwise the operation of this form is similar to thatrepresented in the preceding figures.

From the foregoing description it will be seen that the presentimprovement is suscep tible of somewhat difierent embodiments, and it istherefore evident that the invention is not limited to the exact detailsof, construction herein shown and described.

Having thus set forth the nature of the invention, what I claim hereinis 1. A sewing machine pressezr-foot provided with a thread-cuttingblade having a continuous cutting edge and with an unsharpenedthread-guiding element lying in a plane substantially parallel to saidblade and spaced therefrom and inclined to and in crossing relation withsaid thread-cutting edge, whereby thread guided by said element issevered by a draw-cut.

2. In a sewing machine, a presser-foot having a shank and a foot-platecarried thereby, a portion of said shank overlapping said foot-plate, aclearance space being provided therebetween, and a thread-cuttingknife-blade mounted on the foot-plate and projecting into said space.

3. A sewing machine presser-foot having a foot-plate provided with aseat and with an intersecting notch extending forwardly from its rearend, said foot having a pora foot-plate provided with a seat and with Ian intersecting notch extending forwardly from its rear end, said foothaving a portion overhanging said seat upon one side of the notch, and athread-cutting knife secured to said seat and formed with a. cuttingedge disposed at an angle with and partially overhung by and spaced fromsaid portion of the foot. y

5. A sewing machine presser-foot comprising a shank section having aforwardly extending portion and a foot section pivotally secured to andextending beneath said projecting portion of the shank section andformed in its rearward extremity with a forwardly projecting notchpartially overhung by said portion of the shank section, and athread-cutting knife secured to said foot section, and provided with acutting edge disposed above the outer side of said notch and extendingbeneath said forwardly projecting portion of the shank section.

6. A sewing machine presser-foot having a foot-plate provided rearwardof the needle-aperture with a notch of which one side is inclined towardthe line of stitching, and a knife-blade sustained parallel with theoperative face of the foot-plate and having a cutting edge disposed incrossing relation with said inclined side of the notch.

7. A sewing machine presser-foot having a foot-plate provided rearwardof the needle-aperture with a notch formed with convergent sides bothinclined relatively to the line of stitching, and a knife-bladesustained parallel with the operative face of the foot-plate and havinga cutting edge disposed in crossing relation with one of the inclinedsides of said notch.

8. A sewing machine presser-foot having a foot-plate provided rearwardof the' ALBERT H. DE VOE.

